The application of bipolar membranes MB-2 modified by chromium (III) hydroxide for sodium sulfate conversion process

Козадерова, О. А.; Niftaliyev, S.I.; Kim, K. B.

doi:10.6060/ivkkt201962fp.5811

Cited by 3 publications

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“…An important problem of membrane and electromembrane separation methods in such conditions is to increase the used membrane selectivity. The solution of this problem is mainly developed in two directions: by modifying widely used membranes [7,8] and selecting new polymer membrane materials [9,10]. But first it is necessary to study the structural and kinetic characteristics of the membranes available in industrial production.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the structure transformation effect of ion-exchange membranes on a separation processes efficiency of technological solutions and an ecological safety of food production enterprises

Лазарев

Шестаков

Khokhlov

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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A membrane separation of solutions, along with other purification methods, plays an important role in the effective and ecological safety of food production enterprises and is used for softening and demineralization of water, separation, concentration and purification of technological solutions, as well as for other processes. An important problem of membrane and electromembrane separation methods is to increase the used membrane selectivity. Therefore, the aim of this work was to study the structure transformation effect of ion-exchange membranes on a separation processes efficiency of technological solutions and an ecological safety of food production enterprises using the methods of X-ray diffraction analysis and differential scanning calorimetry (DSC). The analysis of the calculated values of crystallinity degree (CD) by X-ray diffractograms allowed us to identify the different effect of water saturation on the studied membranes. The structure of their material changes, which in turn affects the transport characteristics of the membranes, the efficiency of separation and, ultimately, the environmental ecological safety food enterprises. The cation-exchange membrane MK-40L was characterized by an increase in CD by 5.83%, and the anion exchange membrane MA-41P on the contrary was characterized by a decrease in CD by 5.87%. The crystallite sizes were distributed in the range of 0.096-0.345 nm for the MA-41P membrane and 0.096-0.193 nm for the MK-40L membrane. During thermal studies by DSC one endothermic and exothermic sections were revealed on the obtained curves in the temperature range of 30-202 and 202-498 °C for the MK-40L membrane and 30-223 °C and 223-498 °C for the MA-41P membrane, respectively. The endothermic sections of the curves were characterized by one endothermic peak. Four or five pronounced exothermic peaks were registered on the exothermic sections. At the same time, the MK-40L membrane was characterized by more intense peaks in a water-saturated sample and the MA-41P membrane in the dry one.

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Section: Introductionmentioning

confidence: 99%

Investigation of the structure transformation effect of ion-exchange membranes on a separation processes efficiency of technological solutions and an ecological safety of food production enterprises

Лазарев

Шестаков

Khokhlov

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…В настоящее время на отечественном рынке представлен достаточно небольшой ассортимент коммерчески доступных биполярных мембран. Актуальной задачей науки и промышленности является улучшение свойств уже имеющихся мембран и получение новых биполярных мембран [3,4].…”

Section: Introductionunclassified

Development of top-level software for the process control system for bentonite-containing bipolar membranes

Niftaliev,

Kozaderova,

Ivanov

et al. 2022

Vestn. Voronež. gos. univ. inž. tehnol.

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An approach to automating the technological process of obtaining bentonite-containing ion-exchange bipolar membranes is considered. The structures of automated systems are given, both with the use of local automation tools, and with the use of industrial controllers and workstations. The advantages and disadvantages of each of the structures are described. A two-level control system with the use of sensors, actuators, and an industrial controller at the lower level and a workstation at the upper level is suggested. The scheme of the complex of technical means is implemented. The information model of the upper level software of the control system taking into account the peculiarities of the technological process is developed. The data flow diagram is described and functioning principles of the upper level software are proposed. A software module, that is designed both to calculate control actions for the lower control level and to simulate periodic laboratory bipolar electrodialysis of a sodium sulfate solution with experimental bentonite-containing bipolar membranes to produce acid and alkali, has been developed in C++. During the operation of the software module, it is possible to trace the dependence of technological parameters of electrodialysis (ion flux, current efficiency, energy costs for the production of the target product) on the type of bentonite modifier used (alkyldimethylbenzylammonium chloride (surfactant) and stearic acid) and its quantity in membranes (1, 2, 3% wt.) at different current densities. The software module can be used in existing industries within the framework of functioning process control systems in order to optimize operating parameters during control of electrodialysis processe.

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“…В настоящее время значительно вырос интерес промышленных предприятий к экологически безопасным электромембранным процессам. Так, например, электродиализ с биполярными мембранами позволяет проводить безреагентную конверсию солевых растворов с получением кислоты и щелочи [1][2][3][4][5]. Производительность процесса во многом определяется свойствами применяемой биполярной мембраны.…”

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Influence of a Hydrophobizer on the Properties of Experimental Bentonite-Containing Bipolar Membranes

2022

Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.

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Experimental samples of bipolar ion-exchange membranes were obtained by applying liquid sulfocation exchanger LF-4SK containing bentonite clays treated with stearic acid to an anion-exchange membrane-substrate with quaternary ammonium groups MA-41. The effect of the amount of added bentonite (1, 2, 3 wt%) on the characteristics of membranes was studied. Silicon and hydroxyl of the included bentonite accelerate the dissociation of water molecules, which leads to increasing the concentration of hydrogen and hydroxyl ions during bipolar electrodialysis. Surface modification of bentonite particles with stearic acid improves the dispersion of the clay in the polymer solution. The physico-mechanical characteristics of experimental ion-exchange membranes containing bentonite treated with stearic acid are compared with a membrane containing natural untreated bentonite. The total exchange capacity, density, moisture capacity, as well as tensile strength and relative elongation were determined. The injection of a hydrophobizer into the membrane leads to a decrease in moisture content, an increase in the total exchange capacity and density of the cation-exchange layer compared to a membrane containing bentonite in its original form. The conversion of sodium sulfate (concentration 0.5 mol/dm3) was carried out with experimental bipolar ion-exchange membranes. The use of a bipolar membrane containing bentonite treated with stearic acid (3%) in the cation-exchange layer leads to an increase in the productivity of the process and a decrease in energy costs compared to a commercially available heterogeneous ion-exchange membrane with similar functional groups and not containing catalytic additives. A scheme for obtaining experimental bipolar membranes is proposed, which consists of the following stages: preparation of bentonite; treatment of bentonitewith stearic acid; preparation of anion-exchange membrane-substrate MA-41; coating the membrane-substrate with of a cation-exchange layer.

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The application of bipolar membranes MB-2 modified by chromium (III) hydroxide for sodium sulfate conversion process

Cited by 3 publications

References 0 publications

Investigation of the structure transformation effect of ion-exchange membranes on a separation processes efficiency of technological solutions and an ecological safety of food production enterprises

Investigation of the structure transformation effect of ion-exchange membranes on a separation processes efficiency of technological solutions and an ecological safety of food production enterprises

Development of top-level software for the process control system for bentonite-containing bipolar membranes

Influence of a Hydrophobizer on the Properties of Experimental Bentonite-Containing Bipolar Membranes

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